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So the constraint applies to both molecules

[2] The same body of work clarified that dietary cysteine, cystine, methionine, N-acetylcysteine, and related precursors are effective at supporting tissue glutathione synthesis, whereas intact glutathione taken by mouth faces the additional hurdle of surviving the digestive tract before it can contribute anything

However, elevated ROS levels can harm human spermatozoa through oxidative stress, primarily due to the absence of effective DNA damage repair mechanisms and inadequate antioxidant defenses

a strong feeling of discomfort in the chest and abdomen as well as a feeling or sense of anxiety and fatigue